junginger



(No Model.)

A. HORMEL & G. S. JUNGINGER.

ELECTRIC ARC LAMP.

No. 511,049. Patented Dec. 19, 1893.

W/TNESSES: I

ATM W VA r INVENTZEJ] A TTOHNEY UNITED STATES PATENT OFFICE.

AUGUS" HORMEL AND GEORGE S. JUNGINGER, OF NEW YORK, N. Y,

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 511,049, dated December19, 1893.

Application filed March 24, 1893. $erial No. 46 7,518- (No model.

To all whom it may concern.-

Be it known that we, AUGUST I-IoRiiEL and GEORGE S. JUNGINGER, citizensof the United States, and residents of New York, in the county and Stateof New York, have invented certain new and useful Improvements inElectric Lamps, of which the following is a specification.

Our invention has reference to improvements in electric arc-lamps, andthe object of our invention is to provide an electric arclamp in whichthe carbons are more evenly consumed by the action of the electriccurrent and thereby a steady and uniform light is obtained. Y Ve attainthis object by the mechanism illustrated in the accompanying drawings,in which- Figure 1 is a front view of our improved electric lamp; Fig. 2a detailed view of the rack-holding arrangement; Fig. 3 a section online 3--3, Fig. 2, and Fig. 4 a section on line ll, Fig. 1, Figs. 2, 3,and 4: being on an enlarged scale.

Similar letters of reference indicate corresponding parts.

A in the drawings represents a metallic tube to which the solenoids l3and B are attached in the usual manner on supporting flanges b and b,the upper solenoid B being for the main current and the lower solenoid Bfor the shunt current. In the tube A is loosely inserted the electrode 0which consists of an iron tube and is magnetized by the electric currentpassing through either one of the solenoids, and in the electrode therack D is located which has on its surface a spiral groove, asillustrated in the drawings. The electrode 0 has on its lower end anextension 0 of brass or any other metal that is not magneticallyaffected by the electric current. This extension is provided with twoslits c in which downwardly extending metal springs E E are pivoted bymeans of pivot-pins 0 Set pins or screws 6 e pass through holes in thesprings and project into the groove of the rack, as clearly shown inFig. 2, thus serving as supporting devices and, at the same time, asguides for the rack.

The metal plate It, not shown in Fig. 1, rests on the insulated bracketF and is in metallic connection with the supporting plate I) by means ofsupporting rods f and has two posts ll H which are provided withscrewholes for the set-pins or screws h, which latter touch the springsE, so that a pressure is exerted upon the same and they are pressedagainst the rack, thus holding the pins or set screws e,which passthrough the said springs, reliably in the spiral groove of the rack, asshown in Fig. 2.

The suspending lamp-frame G is secured to the plate F and one carbon gis fastened to the rack D while the other carbon is attached to thelower portion of the suspended lampframe G by means of the carbonholders 7:. k, as usual in electric arelamps.

The electric current by which the lamp is lighted, passes from thegenerator through one of the binding posts Z Z attached to the bracket Fand the plate 71, but insulated therefrom, to the main solenoid B and isat the same time shunted to the shunt-solenoid B. The current passesfrom the solenoid B through the binding-post m to the rack D and to theupper carbon g, from there to the lower carbon g and then through thesuspended lamp-frame G back to the generator. Our improved arc-lampworks in the following manner: As soon as the current passes through thesolenoids the armature O is magnetized by the main-solenoid B and withinthe tube A upwardly attracted, and simultaneously therewith the rack Dwith the upper carbon, as the pins or set screws 6 passing through thesprings E, which are pivoted to the extension c of the armature, asbefore described, project into the spiral groove of the rack and therebyact as supporters for the rack. The supporting function of the pins 6 isincreased by the set screws h passing through the posts H and pressingthe springs toward the rack, so that the pins 6 are in close contactwith the grooved surface of the rack and prevent the latter fromdropping; By the upward attraction of the electrode and the rack thecarbons are disconnected from each other and the light-arc createdbetween the free points of the carbons. As soon as the resistancebetween the carbons increases, the shunt current in the lower solenoid Bbegins to act upon the armature and draws the same down, whereby thesprings are somewhat released from the pressure of the set screws 71/ h,and the rack begins to slowly move down, in which action it is guided bythe screws e 6 projecting into the groove of the rack, so that a rotarymotion is imparted to the rack. This downwardly rotary motion of therack is stopped as soon as the necessary resistance is created again,and then the main solenoid begins its action upon the armature with therack, as before described. In this manner the sudden interruption of thelight, which so often happensin the common arc-lamps, is entirelydispensed with.

Another disadvantage of the electric arclamps now in use is that thecarbons are consumed mostly on one side, so that the pointed portions ofthe carbons receive an uneven shape and the light becomes irregular andunsteady. This disadvantage is also done away with by the constructionof our rack, as the pins e e projecting into the spiral groove of therack cause a rotary downward motion of the'rack, whereby the point ofthe upper carbon continuously changes its position over the point of thelower carbon, so that the carbons are consumed in a regular manner andthereby an entirely uniform light is obtained.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. In an electric arc-1am p a hollow electrodepassing through the solenoids of the lamp and having set screws or pinsattached to its lower end, and a spirally grooved carbon-rack looselyinserted into the hollow electrode, the set-screws or pins projectinginto the groove of the rack, thus serving as guides in moving 3 5spirally grooved carbon-rack loosely inserted 40 into the hollowelectrode, and pins or setscrews passing through or otherwise attachedto the springs and projecting into the groove of the rack, substantiallyas and for the purpose set forth.

3. In an electric arc-lamp, a spirally grooved carbon -rack, incombination with springs having pins projecting into the grooves of therack, and set-screws pressing upon the springs and holding the said pinsin the groove of the rack, substantially as set forth.

4. In an electric arclamp, the combination of an electrode, withdownwardly extending springs pivoted thereto, pins or screws attached tothe springs, a spirally grooved carbon-rack, the said pins projectinginto the groove of the rack, posts on a supporting plate, and set-screwsheld-by the said posts and pressing upon the said springs, substantiallyas set forth.

Signed at New York, in the county and State of New York, this 28th dayof February, 1893.

AUGUST HORMEL. GEORGE S. JUNGINGER. Witnesses:

CHARLES KARP, JACOB HoRMEL.

